<template>
  <div id="app">
    <div class="header">
      <h1 class="title">Refresh & Infinite</h1>
    </div>

    <scroller style="top: 44px"
              :on-refresh="refresh"
              :on-infinite="infinite">
      <div v-for="(item, index) in items" class="row" :class="{'grey-bg': index % 2 == 0}">
        {{ item }}
      </div>
    </scroller>
  </div>
</template>
<style>
  html, body {
    margin: 0;
  }
  * {
    box-sizing: border-box;
  }
  .row {
    width: 100%;
    height: 50px;
    padding: 10px 0;
    font-size: 16px;
    line-height: 30px;
    text-align: center;
    color: #444;
    background-color: #fff;
  }
  .grey-bg {
    background-color: #eee;
  }
  .header {
    position: fixed;
    top: 0;
    left: 0;
    height: 44px;
    width: 100%;
    box-shadow: 0 2px 10px 0 rgba(0,0,0,0.1);
    background-color: #fff;
    z-index: 1000;
    color: #666;
  }
  .header > .title {
    font-size: 16px;
    line-height: 44px;
    text-align: center;
    margin: 0 auto;
  }
</style>
<script>
    import Vue from 'vue'
    import VueScroller from 'vue-scroller'
    Vue.use(VueScroller)
    export default {
        data() {
            return {
                items: [],
                requestTime: 300000
            }
        },

        mounted() {
            for (var i = 1; i <= 20; i++) {
                this.items.push(i + ' - keep walking, be 2 with you.')
            }
            this.top = 1
            this.bottom = 20
        },
        methods: {
            refresh (done) {
                setTimeout(() => {
                    var start = this.top - 1
                    for (var i = start; i > start - 10; i--) {
                        this.items.splice(0, 0, i + ' - keep walking, be 2 with you.')
                    }
                    this.top = this.top - 10
                    done()
                }, this.requestTime)
            },
            infinite (done) {
                setTimeout(() => {
                    var start = this.bottom + 1
                    for (var i = start; i < start + 10; i++) {
                        this.items.push(i + ' - keep walking, be 2 with you.')
                    }
                    this.bottom = this.bottom + 10
                    done()
                }, this.requestTime)
            }
        }
    }
</script>